US4331861A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Positive temperature coefficient (PTC) resistor heating device
Assignee: Siemens AG
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Filing: 1980-08-25
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Granted: 1982-05-25
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Expires: 2000-08-25
Abstract
Abstract A heating device has a PTC resistor plate as the heating element and is covered with an insulating body. Between the heating element and the insulating body, on each of opposite surfaces of the heating element, ductile metal layers, preferably aluminum, are provided under a permanent pressure of at least 0.3×10 8 Pa, the layers being designed as current supply electrodes having electrical terminals. The resistor plate may advantageously have a surface roughness in the magnitude of 100 μm.
Inventors
- 👤 Hans Meixner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 03:01
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/02; H05B3/06; H01; H01C; H01C1/00; H01C1/14; H01C1/1406; H05B3/10; H05B3/12; H05B3/14; H05B2203/00; H05B2203/02
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
78 words
A heating device comprising: a positive temperature coefficient resistor plate including a pair of opposite surfaces; a pair of ductile metal layers contacting respective ones of said opposite surfaces, said electrodes not being unitary parts of the PTC resistor plate; and means urging said ductile metal layers against the respective surfaces at a permanent pressure of at least 0.3×10 8 Pa, each of said ductile metal layers constituting a current supply electrode and including a respective electrical terminal.
Claim 2
Dependent Claim
78 words
A heating device comprising: a positive temperature coefficient resistor plate including a pair of opposite surfaces; a pair of ductile metal layers contacting respective ones of said opposite surfaces, said electrodes not being unitary parts of the PTC resistor plate; and means urging said ductile metal layers against the respective surfaces at a permanent pressure of at least 0.3×10 8 Pa, each of said ductile metal layers constituting a current supply electrode and including a respective electrical terminal.
Claim 3
Dependent Claim
15 words
The heating device of claim 1, wherein: each of said ductile metal layers comprises aluminum.
Claim 4
Dependent Claim
25 words
The heating device of claim 1, wherein: each of said surfaces of said resistor plate has a surface roughness in the magnitude of 100 μm.
Claim 5
Dependent Claim
87 words
A heating device comprising: a positive temperature coefficient resistor plate including a pair of opposite surfaces, each of said surfaces having a roughness in the magnitude of 100 μm; a pair of ductile aluminum layers, each constituting a current supply electrode and including a respective electrical terminal and each contacting respective ones of said opposite surfaces, said electrodes not being unitary parts of the PTC resistor plate; and means urging said aluminum layers against the respective surfaces at a permanent pressure of at least 0.3×10 8 Pa.
Claim 6
Dependent Claim
87 words
A heating device comprising: a positive temperature coefficient resistor plate including a pair of opposite surfaces, each of said surfaces having a roughness in the magnitude of 100 μm; a pair of ductile aluminum layers, each constituting a current supply electrode and including a respective electrical terminal and each contacting respective ones of said opposite surfaces, said electrodes not being unitary parts of the PTC resistor plate; and means urging said aluminum layers against the respective surfaces at a permanent pressure of at least 0.3×10 8 Pa.
Claim 7
Dependent Claim
31 words
The heating device of claim 4, wherein said means urging said aluminum layers against respective surfaces comprises: a housing; and spring means clamping the layered structure within and against said housing.
Claim 8
Dependent Claim
27 words
The heating device of claim 5, and further comprising: a pair of insulating layers respectively disposed between an aluminum layer and said housing and said spring means.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-05-24 | 1985-11-23 | 1986-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-05-24 | 1989-11-23 | 1990-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-05-24 | 1993-11-23 | 1994-05-25 | $7700.00 | Window Closed / Lapsed |